Rock-drill.



Nu. 675,3l9. Pa tented May 28, I901.

- w. 3. nova, 3rd.

ROCK DRILL.

(Application filed June 22, 1900.) (No Model.) 2 Sheets-Sheet l.

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No. 675,3!9. Patented May 28, I90I.

W. S. BOYD, 3rd.

ROCK DRILL. (Applica tion filed June 22, 1900.

2 Sheets-Sheet 2.

(No Model.)

E N 0D. TYWFKE 4 N WR lNv w ULIITED "STATES PATENT Fries. I

WILLIAM sf'uoYD, 3RD, or Los ANGELES, (JALIFOl-KNIA.

ROCK-DRILL.

- SPECIFICATION forming part of Letters Patent No. 675,319, dated. May28, 1901.

' Application filed June 22, 1900. SerialNo. 21,177. (No model.)

To all whom/it lit/(y r'n/mc/vt: Be it known that I, WILLIAM b. BOYD,3rd, a citizen of the United States, residing at Los j Angeles, withpost-office address at 534 South Broadway, Los Angeles,) in the countyof Los Angeles and State of California, have in vented certain new anduseful Improvements I in Rock-Drills, of which the following is a full,

clear, and exact description,reference being had. to the accompanyingdrawings, which form apart of-this specification.

y Myinvention relates to certain new and use- 'i'ul improvements inrock-drills; and my invention consists in certain features of noveltyhereinafterdescribed and claimed.

Figure I is a vertical longitudinalsection of my improved device,showing the carriagesu'ppofrt. Fig. IIisa side elevation. Fig. III is.,a. transverse section taken on line III III, Fig. V. F g. I'VIis-asection taken on line IV' IV, Fig; VIII. lrig'V is 'a verticallongitudinal section of the body of the drill, taken on line V V, Fig.\I.. Fig. V1 is a'rear olevation. Fig. VII is a transverse section takenon line VII VII, 13g. II. t ,Fig. VIII is in part an el e vation and inpart ajsectienshowin g the 7 represents a feed-screw con uected with thebed-plate 6 and having a hand-wheel S'for operatingthe same, thefeed-screw? passing through a bracket 9 on the lower side of the casing,whereby the turning of the screw JIIOVQS the casing and'drill. eitherforward or backward. v

10 represents a screw-plug at the rear end of the casing l, and Iirepresents a screwplug at the front end of the casing.

1; represents a striker-shaft extending into ihc'eyliiider 1 and havinga flange ill on its -'iune r end, said strikcr-shaft having an enthereduced section of the shaft extending through a central aperture 11 inthe screwplug 10 at the rear end of the casing.

17 represents a cam-wheel having a series of cams 18 on its outerperiphery and having a beveled gear-wheel 19 on its inner periphery.

The, cam-wheel 17 is loosely mounted on a the striker-shaft is freed andpermitted to travel in the opposite direction, it being forced in saiddirection by means of an actuatingspring 26, which has been contractedby the cam pressing against the arm and forcing the striker-shaft in theopposite direction.

27 represents a hammer-head with a pin 28 on its inner face, which fitsinto a recess 2!) on the inner end of the striker-shaft. v

30 represents a drill-shaft located in the central aperture 31 in theplug 11 l at the front end of the casing, said drill-shaft having achuck 32 secured to its outer end, to which a drill may be attached.

represents a ham mer-head secured to the rear end of the drill-shaft bymeans of a pin 31, litting into a recess 35 in the same inannor that thehammer-head 27 is secured to the striker-shaft. 'lhnssaid hammer-headswhen battered up or ii for any other purpose they may need repairing canbereinoved and rc placed without haviugto remove the shafts. 'lliedrill-shaft is thrownforwardwith the drill by the impact oithestrikeieshaft, the

hammer-hem 27 striking the hammer-head Zilhand is rcciproeaied in theopposite direction by means of a coitspring tie, resting on a hub 87on-the inner face of the plug 1 I, the drill-shaft being thus returnedto its normal position. In order to prod nee the most ell'eetlarged'section II and a reduced section 15, l ive results, it is desirable thatas Li e drill is thrown forward it should also travel in a 1'0- tarydirection. To accomplish this, I provide a bar 38, having its rear endsecured at 8:) to the flange 13 of the striker-shaft, said bar extendingforwardly and at an angle to the length of the easiug,whcreby when thestrikershaft is recirnocated said bar will also be re rcciprocatcd.

-t0 represents an annular ring resting in a groove 'll at the rear endof the drill-shaft, said ring being provided with a recess 41, throughwhich the bar 38 extends, the effect being that as the striker-shaft isthrown forward the bar 38, moving forward. and at the same time towardthe side of the casing, will cause the annular ring and drill shaft topartly rotate in one direction, while the annular ring is returned tothe initial point by the bar traveling in the opposite direction as thestriker-shaftrcciprocates. "lhe ringlt) is looselygmounted on thedrill-shaftand is connected with the same by means of pawls ill,

' plug secured to the rear end of the cylinder,

engaging a ratehet-whecl =14: on the drillshaft.

4 5 represents a door by which access may be had to the interior of thecasing.

415 represents an operating-wheel having gear-teeth -17, which mesh withthe cam gearwheel.

48 represents a crank for operating the wheel 46.

t9 represents studs on each side of the easing, to which the wheel l6may be attached, thus operating the device from either side.

50 represents a ball-bearing for the wheel 46.

The flange 1.3 of the striker-shaft '12 is provided on its outerperiphery with grooves 51, in which ribs 52 on the inner-sides ot' theeasing extend in order to form a guide for said striker-shaft as itrcciprocates.

I claim as my invention 1'. Arockdrillcomprisingacylinderformed withgrooved legs, and a pendent bracket, a bed-plate formed with arms, railssupported on the arms and providing tracks for the grooved legs of thecylinder, a feed-screw working in the pendent bracket, turning in thearms of the bed-plate, and having an operating hand-wheel, a plugsecured to the front end of the cylinder, aplug secured to the rear endof the cylinder, a drill-shaft, mounted in the front plug, having aremovable head, a spring for throwing the drillshaft rearward, astrikenshaft mounted in the rear plug, having a removable head, a springfor throwing the striker-shaft forward, a collar mounted on thestriker-shaft, having radial arms, a driven bevel gear-wheel mounted onthe rear plug having cams adapted. to impinge against the radial armsfor retracting the striker-shaft, and a driving bevel gear-wheeljournaled to the cylinder and meshing with the driven bevel gear-wheel.

2. A rock-d rill comprisingacylinder, aplug secured to the front end ofthe cylinder, a plug secured to the rear end of the cylinder, adrill-shaft mounted in the front plug having a removable head, a springfor throwing the drill-shaft rearward, a striker-shaft havingascrcw-threaded rear end, monntedin the rear plug, and having aremovable head, a spring for throwing the striker-shaft forward, anadjustable collar mounted on the rear end of the striker-shaft andhaving radial arms, aunt adjustable on. the rear end of thestriker-shaft, a drivenbev'el gear whecl mounted on the rear plug havingcams adapted to impinge against the radial arms for retracting thestrikenshaft, and a driving bevel gear wheel journaled to the cylinderand meshing with the driven bevel gear-wheel.

A rock-d rill com prising acylinder, aplug secured to the front end ofthe cylinder, at

a drill-shaft formed with an annular recess at its inner end, andmounted in the front plug, a spring for throwing the drill-shaftrearward, a striker-shaft formed with a flange at its inner end, andmounted-in the rear plug, a spring for throwing the striker-shaft for--ward, an annular ring having a peripheral recess and located in theannular recess of the drill-shaft, a pawl secured to the annular ring, aratchet-wheel mounted on the drillshal't with which the pawl engages, abar located at an angle to the cylinder, secured, at its rear end to theflange on the striker-shaft and having its forward end engaging in therecess of the annular ing, a collar mounted on the rear end of thestriker-shaft and having radial arms, a driven bevel gear-wheel, mountedon the rear plug, having cams adapted to impinge against the radial armsfor retracting the striker-shaft, and a driving bevel gearwheeljournaled to the cylinder and meshing with the. driven bevel gear-wheel.

=1. In a rock-drill, the combination of a casing, independent strikerand drill shafts mounted in said casing, removable hammerhcads securedto the ends of the meeting ends of the shafts, a spring for actuatingthe striker-shaft, an annular ring on the drillshaft havingpawl-and-ratchct connection with said shaft, said annular ring having arecess near its periphery and a bar engaging said recess adapted totravel at an angle with the casing and having one of its ends fixed tothe strikingshaft, substantially as set forth.

XVILLTAM S, BOYD, 3m).

\Vitnesses:

J. W. KEMP, Jns. E. KNIGHT.

